Thanks guys for sharing. I don't know anything about cars, so you can imagine how much money I have spent taking my ML320, which I have had for 14 years to Mercedes. Lately, given I am very short on cash, I have tried doing a few things on my own, and have been fairly successful.

However, now my ABS light is on, and I am told it could be my ABS pump. About two years ago, my wiper fluid leaked, and I believe it might have contributed to my ABS/ETS/BAS lights coming ON; it has been about five months. I have read all the posts on this, and have located the ABS pump on the driver's side. However, I am not sure of the easiest to gain access to the module, so I could verify what, if anything is wrong with it.

Could someone please advise me on the easiest way to reach this module?

Thanks a bunch guys!

I have also got the ABS and ETS lights coming on as soon as I press the brake pedal, and no brake lights on my 2001 ML55.

I checked the brake light switch, both sets of contacts seemed good, but replaced it with a new MB switch anyway - no change.

I have swapped relay K25 over with each of the others around it .... and checked that there is 12V on both sides of the ABS motor fuse.

I am now trying to remove the plug on the back of the ABS module, to check the power cables there. I can lift up the housing of the connector about 1,5 cm, but then it stops and won't go any higher .... and I can't see any clips holding it back, and can't find any other way to pull this connector off :-(

What is the trick here ??

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Hi guys!

I can't believe this thread is still going since i started it in 2006! I still have the 98 ML and the ABS has worked fine since I fixed it with a soldering iron.
Reading first message on the first page will help you troubleshoot this. As I read, I note that the 15 pin connector may also be a failure point. Unplugging and re-plugging a connector is a classic fix for MB electrical circuits throughout history! read my comments, paragraph 8 the way i address following this circuit will help you find bad wires, bad connectors, bad solder joints, etc READ POST #! in this thread!

Jim in Phoenix

I finally managed to get the 15 pin plug off the ABS board module, and the module unscrewed and removed from the ABS pump assembly.

The lower two pins on the 15 pin connector on the ABS board module meter out to the relevant two pins on the top of the board with zero resistance and the contact is not lost as the module is shaken or moved, so I think the fault lies elsewhere.

When the engine is running, there is ca. 14V on the fuse for the ABS pump, but only 9V on the hot wire of the ABS module plug, so maybe that isn't enough to run the ABS pump, and I am now off to try and find out where this voltage loss is occurring